Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Coral Reef Research Center of China, School of Marine Sciences, Guangxi University, Nanning 530004, China.
Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Coral Reef Research Center of China, School of Marine Sciences, Guangxi University, Nanning 530004, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China.
Sci Total Environ. 2022 Nov 15;847:157442. doi: 10.1016/j.scitotenv.2022.157442. Epub 2022 Jul 25.
The behavior and fate of PAHs are affected by multiple meteorological factors, but the main factors driving PAHs in tropical mariculture areas are still not clearly understood. This study continuously monitored PAHs in a few tropical land-based mariculture ponds, discussed their dynamic change trend, migration among the multiple media, and the relevant affected factors. Results indicated that PAHs were widely distributed in these environmental media, and the PAHs' concentration showed an obvious attenuation trend in the mariculture cycle. Wet deposition brought overwhelming majority atmospheric PAHs (92 % ± 5.7 %) to the aqueous system, and >72 % of these PAHs came from oil combustion-related sources and biomass combustion. Compared with the natural sea areas in the same region, mariculture ponds sediment could be changed from a sink at the early stage to a secondary release source of PAHs at the late stage of the rainy season, which intensifies the bioaccumulation of PAHs and the risk of edible carcinogenesis of aquatic products. Our research revealed that rainfall drove the occurrence and environmental behavior of PAHs in the tropical mariculture areas, while land-based mariculture ponds ecosystem affected the regional environmental fate of PAHs and weakened their transmission to the marine environment from land.
多环芳烃的行为和归宿受多种气象因素影响，但热带海水养殖区驱动多环芳烃的主要因素仍不清楚。本研究连续监测了几个热带陆基海水养殖池塘中的多环芳烃，讨论了它们在多种介质中的动态变化趋势、迁移以及相关影响因素。结果表明，多环芳烃广泛分布于这些环境介质中，且在养殖周期中多环芳烃浓度呈明显衰减趋势。湿沉降将绝大部分大气多环芳烃（92%±5.7%）带入水相系统，其中>72%的多环芳烃来自于石油燃烧相关源和生物质燃烧。与同一地区的天然海域相比，养殖池塘底泥在雨季的早期可能由汇转变为多环芳烃的二次释放源，这加剧了多环芳烃的生物累积和水生产品致癌的风险。我们的研究表明，降雨驱动了热带海水养殖区多环芳烃的发生和环境行为，而陆基海水养殖池塘生态系统影响了多环芳烃在区域环境中的归宿，并减弱了其从陆地向海洋环境的传输。
